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194
MORPHOLOGY AND EVOLUTION
externus. Some authors have stated that this muscle corresponds to the tensor fasciae femoris, but both muscles are present in many examples of these Apes.
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Fis. 36.—The muscles of the leg and the knee-joint in the Chimpanzee. A, origin of the muscles from the pelvis; B, muscles of the hallux; C, the adductor brevis and obturator nerve ; D and E, situation of bursse; F} the knee-joint. A.D. and £.D., anterior and posterior divisions of the obturator nerve; A.C.L. and P.C.L., anterior and posterior cruciate ligaments: ADD. BEEV., ADD. LONG., and ADD. MAG., adductores brevis, longus and magnus ; C.T., connecting fibrous strip; E.L.H., extensor longus hallucis; E.S.C. and i.s.c., external and internal semilunar cartilages; GEH., gemelli; GLUT. MED., gluteus medius; GBA., gracilis; I.C.B., entocuneiform ; MET.I, first metatarsal; 2f.B., scaphoid ; OBT. EXT. and OBT. 12TT., obturatores externus and internus; PECT., pectineus; PYB., pyriformis; T.A., tibialis anticus; Bur., bursse. Note the ligamentous pulley for the tendon of the extensor longus hallucis in fig. B.